Plant that's welcome on breakfast plate? (4-3-5)

I believe the answer is:

eggs-and-bacon

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'plant that's welcome' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'on breakfast plate?' is the wordplay.
I cannot really understand how this works, but
'on' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for eggs-and-bacon that I've seen is " Plant; common breakfast".)

I've seen this clue in The Telegraph.

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